ASTM F1482-94a

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: F 1482 – 94a
Standard Guide to
Wood Underlayment Products Available for Use Under
Resilient Flooring
This standard is issued under the fixed designation F 1482; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope Particleboard —The Ideal Floor Underlayment
1.1 This guide outlines the types of wood underlayment
3. Terminology
products commonly available for use under resilient flooring.
3.1 Definitions:
1.2 This guide points out the subfloor factors that shall be
3.1.1 resilient flooring—resilient material in tile or sheet
controlled in preparing underlayment as a base for resilient
form that is used to cover the underlayment referred to in this
flooring.
guide.
1.3 This guide does not cover the structural adequacy of the
3.1.2 subfloor—that structural layer intended to provide
subfloor or combination subfloor-underlayment which is gov-
support for loadings which may receive resilient floor cover-
erned by applicable regulatory agencies, nor does it apply to
ings directly, if the surface is appropriate, or indirectly by way
wood underlayment over concrete floors.
of an underlayment if its surface is not suitable.
1.4 This guide does not supersede, in any manner, the
3.1.3 subfloor underlayment—a structural floor system in
underlayment manufacturer’s or the resilient flooring manufac-
which the upper surface is suitable to receive resilient floor
turer’s instructions. Not all underlayment products are ap-
coverings.
proved by all resilient flooring manufacturers.
3.1.4 underlayment—that layer of material usually installed
1.5 This guide does not attempt to cover details of under-
on or over a subfloor that provides a surface suitable to receive
layment installation. Follow the detailed instructions of the
resilient floor covering.
flooring or underlayment manufacturers or both. Where con-
flicting instructions exist, consult the manufacturer’s warranty
4. Significance and Use
coverage.
4.1 Resilient tile and sheet floor coverings are installed over
2. Referenced Documents various surfaces. This guide provides general information on
the types of wood underlayment panels available for use
2.1 ANSI Standards:
beneath resilient flooring.
ANSI/A208.1-1993, Particleboard
ANSI/AHA A135.4-1988 Basic Hardboard
5. Materials and Descriptions
2.2 Other Standards:
5.1 Plywood is composed of veneer layers, which are glued
HPMA Standard HP-1 (1992), Interim Voluntary Standard
4 together with adhesive. The grain orientation of the veneers
for Hardwood and Decorative Plywood
alternate so that the face veneers have the grain running in the
U.S. Product Standard PS 1-83, Construction and Industrial
4 long direction of the panel and the core veneers alternating in
Plywood
the grain direction. Underlayment grades of softwood plywood
APA Design/Construction Guide: Residential and Commer-
4 have a special inner-ply construction to resist indentation and
cial, Form E30
puncture from concentrated loads.
U.S. Product Standard PS 2-92, Performance Standard for
4 5.2 Oriented Strand Board (OSB) is made of thin narrow
Wood-Based Structural-Use Panels
strands of hardwoods and softwoods which are longer than
Installation and Preparation of Plywood Underlayment for
4 they are wide. These strands are dried, screened, blended with
Resilient Flooring, Form L335
adhesive, and formed into a multilayered mat. In the surface
layers, the long direction of the strand is oriented so that it is
This guide is under the jurisdiction of ASTM Committee F-6 on Resilient Floor
parallel to the long direction of the panel. The strands in the
Coverings and is the direct responsibility of Subcommittee F06.40 on Special
core are perpendicular to the surface strands.
Properties.
5.3 Waferboard is made from thin wafers of wood which are
Current edition approved Dec. 15, 1994. Published February 1995. Originally
published as F 1482 – 94. Last previous edition F 1482 – 94.
usually equal in width and length. The wood wafers are dried,
National Particleboard Assoc., 18928 Premiere Court, Gaithersburg, MD
screened, and blended with adhesive.
20879.
5.4 Particleboard is manufactured from lignocellulosic ma-
American National Standards Institute, 11 West 42nd St., 13th floor, New York,
NY 10036.
terials (usually wood) primarily in the form of discrete pieces
American Plywood Assoc., P.O. Box 1700, Tacoma, WA 98411-0700.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
F 1482
or particles, combined with a synthetic resin or other suitable floors, areas close to furnaces and ducts used for heating and
binder and bonded together under heat and pressure in a cooling shall be insulated.
hot-press. Other materials may be added during manufacture to
8. Selection of Underlayment
improve certain properties. Particleboard for floor applications
is defined by ANSI/A208.1, as Grade PBU for underlayment or 8.1 Select underlayment according to the recommendations
Grades D-2 or D-3 for manufactured home decking. of the resilient flooring manufacturer. Additionally, the under-
5.5 Hardboard is a panel manufactured primarily from layment manufacturer’s recommended installation methods
inter-felted lignocellulosic fibers which are consolidated under and end use service environment shall all be considered to
heat and pressure in a hot-press to a density of 31 lb/ft (496.62 avoi
...